Othello 4? (Act 3, Scenes 3 and 4)

            Iago meets some unexpected turns in his plan, but successfully causes Othello to become insanely jealous and paranoid of Desdemona's unfaithful feelings towards Cassio. Othello for once realizes the many desirable qualities Cassio has that he does not: light skin, charm, intelligence, and Brabantio's approval. Iago highlights him as being, "Of her own clime, complexion, and degree" (III.iii.270). Once Othello becomes fully aware of his disadvantages, and once he is told of some possible proof of Desdemona's infidelity, he is outraged and begins to act on his emotions. His actions greatly contrast his collected and dignified presence in the beginning of the play. With each word he spoke, he sounded eloquent and powerful, despite his race. Othello believes that Desdemona, the main source of his happiness in the middle of the play, has noticed his imperfections and does not approve of them. This insecurity of Othello's is the cause of his verbal downfall.